a lot of things could o been better, tbh i agree with most of your list...

It might also simply be because of their general success, in a way. If an anime is simply mediocre it's easy to brush it off, but if it's genuinely amazing in some way then its flaws are all the more irritating and harder to ignore.

But going through my MAL the average score for that list was a 7.785, which isn't too shabby.

sword art online could've have been good if they had better character development for kirito and made the show seem less rushed

Yea it really had so much potential. I mean if I was the director I would have played out the first arc to 26+ episodes to really flesh out the entire world of Aincrad, show how Kirito manages to be the highest level and how he is the "front lines", and so much more. The first 2 episodes were so promising.

There was a lot in this that had the potential to be a masterpiece. I was hooked in the beginning and I really wanted it to succeed. Instead, it went the route of too many episodic fillers, one dimensional characters, a level of rushing that didn't allow it to develop, and a second arc that made it fall so hard I think the earth shook.

Honestly though, Guilty Crown does belong here. It was a pretty good anime (I gave it an 8/10 on my MAL and tagged it as a noteworthy series), but it straight-up omitted huge amounts of its own plot. Like who the hell IS this kid.

Spoiler Alert! Click to show or hide

(I swear that caption is as relevant to his character as his character is to the series).

Guilty Crown is a lot like Code Geass in that both their Wikis have a bunch of pages that are like "No one actually knows anything about this topic, but it's mentioned in the show and is presumably important so here's a page."

Anyway, both should've had better plots, so they're pretty easy to bring up here. That's not to say that either one is bad, just that people actually liked them enough to wish they had been done better. Which is actually kind of a compliment.

I've got a few.
1. Sword Art Online. That halfway point and on threw away all of the potential that anime had of being one of my favorites.
2. Fortune Arterial. The ending was just plain disappointing. Going into the conclusion, it was amazing.
3. Haruhi Suzumiya Season 2. Get rid of the Endless 8 and we'll talk.
4. Dream Eater Merry. If the animation style wasn't so poor, this would have been amazing. Watching the fight scenes gave me an idea of what drunk people see. Not only that, I feel like there should be some romance between Yumeji and Merry. It just seems appropriate.
5. I'm ready for the hate mail on this one: Toradora. Look, none of these anime are bad. I just want to say that at face value. These are the anime that could and should have been done better. Toradora is one of them. Why? The comedy value was lower than what I hoped and expected. It was still funny, but the comedy needed to stay around for the full series and not just until the three quarter mark.

Now, there are the completely horrendous anime that cannot be saved. Examples?
Naruto. Bleach. One Piece. School Days. High School of the Dead (yes I am serious). The entire Dragon Ball series. Strike Witches. Yugioh.

Honestly though, Guilty Crown does belong here. It was a pretty good anime (I gave it an 8/10 on my MAL and tagged it as a noteworthy series), but it straight-up omitted huge amounts of its own plot. Like who the hell IS this kid.

Spoiler Alert! Click to show or hide

(I swear that caption is as relevant to his character as his character is to the series).

Guilty Crown is a lot like Code Geass in that both their Wikis have a bunch of pages that are like "No one actually knows anything about this topic, but it's mentioned in the show and is presumably important so here's a page."

Anyway, both should've had better plots, so they're pretty easy to bring up here. That's not to say that either one is bad, just that people actually liked them enough to wish they had been done better. Which is actually kind of a compliment.

I agree with exactly what you typed here on Guilty Crown. I liked it as well but that doesn't mean it gets a pass. Don't think I could have stated my explanation better.